Therapeutic lamp



March 12, 1929. R. H. MAXSON THERAPEUTIC LAMP Filed July 25. 1927 jnrenfor Patented Mar. 12, 1929.

UNITED STATES PATENT OFFICE.

ROLLAND H. MAXSON, OF MILTON, WISCONSIN, ASSIGNOR TO THE BUBDICK COB/-PORATION, OF MILTON, WISCONSIN, A CORPORATION OF DELAWARE.

THERAPEUTIC LAMP.

Application filed July 25, 1927. Serial No. 208,170.

My invention relates to therapeutic lamps.

It will be explained as embodied in a relatively small portable lamp,such as is ordinarily used for more or less local treatments in aphysicians otlice, laboratory or at a patients home, although, ofcourse, it is applicable to larger sizes for more general application.The portable or smaller size. such as that chosen to illustrate thefeatures of the invention, may be more or less permanently mounted onany desired and appropriate support.

One of the objects of my invention is to provide an improved therapeuticlamp.

Another object is to provide an improved double-walled reflector for atherapeutic radiant energy generator.

Another object is to provide a well ventilated reflector.

Another object is to provide a relatively deep reflector with acomparatively flat refleeting surface.

Another object is to provide a lamp reflector-casing wherein thereflector can be removed without disturbing any other part of thestructure.

Another object is to provide a therapeutic lamp in which a ventilatedcasing is employed for surrounding the major part of the reflectorproper, the base portions of the radiant energy generating unit andelectrical connecting members therefore so that during manipulation theoperator Will not; touch the hot reflector walls nor disturb the sup:

port and electrical connections of the generating unit.

A further object is to provide a therapeutic lamp which is soconstructed as to readily facilitate the removal of any element thereoffor replacement without the use of special tools.

-A further object is to provide in a theras pcutic lamp a reflectorhaving a reinforcing otl'set portion at its periphery which alsoperforms the additional function of serving as a positioning and holdingelement for an outer casing.

Another object is to provide a reflector of pleasing appearance. simpleand rugged construction. and etl'ective in use.

Other objects and advantages will hereinat'tcr appear.

An embodiment of the invention is illustratcd in the accompanyingdrawing, where- Fig. 1 is a side elevation, partly in section, of theassembled lamp, and

Fig. 2 is a sectional view on line 22 of Fig. 1.

The lamp comprises. in general, an outer shell or casing A supporting anelectrical screw plug receptacle It for receiving a radiant energygenerating unit t. and :1 relatircly tiat dish shaped rellector I) heldwith in the casing A.

Casing A is substantially parabolic in contour and has a rearwardlyextending some what cup shaped depressed portion 1 about its axis. Thiscup shaped extension has a Hat rear wall 2 provided with a centralopening t through which the base of re ccptacle 15 projects.

The means for holding receptacle ll fixed in the position shown in Fig.1 includes four metal rods or bolts 5 having reduced portimis (l attheir inner ends which extend through four equally spaced apart openingsin a metal plate 7. Metal spacer sleeves 8 are disposed over portions 6of rods 5 so as to space plate 7 a predetermined distance from wall 2.Rods 5 are threaded at their rear ends and a pair of nuts 9 disposedupon each of the threaded ends to securely anchor plate 7 thereto.

Receptacl B has a pair of outwardly Plc jet-ting perforated lugs or ears10 for r ceiving screws 11 which thread into holes in plate 7, and thusrigidly support base 1% with respei-t to casing A.

That portion 12 of base l3 which supports electrical terminals 13 andextends through opening 4 in wall 2, is covered by a cap 14. (ap 14 hasskirt 15' through which the threaded and reduced ends of rods 5 projectand which is clamped in place against nuts .1 by nuts 15 threaded uponthe rear ends of the rods. Cap '14 has an annular lining 16 of fibre orsimilar insulating material to prevent contact between the terminalwires of conductor cord 17 and the walls of the metal cap. A tubularthreaded nipple 18 securely attached to cap 14 serves as a conduitthrough which the conductor cord is lead to the receptacle and as asupport whereby the lamp may be attached to a suitable handle orbracket.

Reflector D is of the shallow type so as to afford radiation of energyfrom unit C over a relatively large area at short range. The reflectoris preferably constructed of light,

highly-polished metal. such as aluminum. Its outer'end is flangedoutwardly and then forwardly so as to provide an annular shoulder 20against which the. outer rim of the shell or casing can be tightly drawnand a substantially cylindrical shallow rim 21 projecting beyond thereflector. In order to strengthen the rim of the reflector, eliminate asharp edge and improve its appearance, the margin of the reflector isrolled outwardly into a head 22. The rear of the reflector is providedwith an axial opening through which the base of the generating elementmay be inserted into the receptacle. This opening is surrounded by arearwardly projecting flange 23 which may fit rather snugly about thebase of the generating element. Around the margin of this opening in thereflector are a set of holes for re ceiving the outer ends of bolts 5\\'llr):-t nuts 24 serve to draw and anchor the reflector and its outershell together. Thus the rods or bolts 5 each cooperates with thereflector, receptacle, outer shell and rear cap to hold the sametogether in a unit adapted to receive a radiantenergy generatingelement.

In order that casing A may be kept relatively cool while in use,ventilating apertures E26 and 2? are provided through its side wallsadjacent to and parallel with rim 3 and rcarwardly extending portion 1,respectively.

The radiant energy generator may be of any appropriate type but; Iprefer to use and have illustrated the construction set forth in myco-pending application, Serial No. 193,221, tiled May 21, 1917. Ingeneral, this element comprises an insulating base 30 carrying an outerscrew plug shell 31 and center contact 32 for engaging the outer screwand inner contacts, respectively, of receptacle B. The base also carriesa resistor 33 embedded in a rigid supporting and heat and light emittingenvelope composed of *arborundum and a suitable binder. This resistor isconnected to contacts 331 and 32 so that when the element is screwedinto the reflector receptacle it is in circuit.

\Vhen the lamp is in service, it is supported on a. handle by theoperator or at tached to some fixture or on a suitable standard. Thereflector directs the rays of radiant energy and the outer shell orcasing sup ports and protects the reflector, insures a good circulationof air thereabout, and shields the patient and operator from beingburned if they should come in contact with it.

In the event that it becomes necessary to replace the reflector D, it isonly necessary to remove nuts 24 to release the reflector so that it maybe readily removed and replaced.

The structure of the lamp is such that its outward appearance presents asubstantially uniform and unobstructed surface which greatly enhancesits appearance, the protruding rim of the reflector, because of itshighly finished surfaces, greatly adding to the finished appearancethereof.

Having thus described my invention, what I claim as no and desire tosecure by Letters Patent of the United States is:

1. A therapeutic lamp con'iprising a casing open at the front, a concavereflector having a circumferential outwardly offset portion at itsperiphery forming a shoulder on the outer wall of the reflector,disposed within said casing, said shoulder resting against theperipheral edge of the casing, means for mounting a radiant energygenerating unit in said lamp with the active portion thereof in front ofsaid reflector, and means for securing said reflector against movement.with respect to said casin 2. A therapeutic lamp reflector casingcomprising a parabolic-like outer shell, a relatively flat reflectorwithin the shell and having an annular flange to provide a shoulderagainst which the edge of the shell is drawn and a rim projecting beyondthe shoulder, a receptacle within the rear partof the shell, and meansfor clamping the shell, reflector and receptacle together.

3. A therapeutic lamp reflector casing comprising a flaring dish shapedreflector having an opening through its smaller end and an annularshoulder adjacent its larger end, a flaring outer shell within which thereflector is mounted, a receptacle for holding a radiant energygenerating element, a plate attached to the receptacle, and a series ofbolts each of which passes through the reflector, shell and plate toanchor the parts together and draw the outer shell against 1 theshoulder of the reflector.

4. A therapeutic lamp reflector easing comprising a flaring outer shellhaving an opening through its smaller rear end, a reflector within theouter shell, a cup covering the opening in the rear end of the shell, a

receptacle. located in the rear of the shell to receive a radiant energyen rating element inserted through the opening in the reflector forsecuring the receptacle in position within the shell, and means forsecuring the reflector and the en against movement with respect to theshell.'

5. A therapeutic lamp comprising a shallow reflector, a relatively deepcasing partially receiving the reflector, a radiant energy generatingunit, means including a plate, for mounting said generating unit freefrom contact with said deep casing with its inactive portions in saiddeep casing and its active portion in front of said reflector and othermeans associated with said firstnamed means for securing the reflectoragainst movement with respect to the casing and for supporting saidplate.

6. A therapeutic lamp reflector casing comprising a flaring dish-shapedreflector having an opening through its smaller end, :1, flaring outershell within which the refleetor is mounted, a receptacle for holding :1radiant energy generating element, a plute attached to the receptacle,a, plurality of bolts, each of which pass through the inner end of theflaring outer shell through said plate and through the inner end of thedishshaped reflector adjacent to the opening at its smaller end to drawthe parts together and to support the plate with its receptacle freefrom contact with the reflector and shell. In witness whereof, Ihereunto subscribe my name this 18th day of July, 1927.

ROLLAND H. MAXSON.

